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        <h1 class="title">Servlet lifecycle</h1>
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                <time datetime="2019-04-06T15:06:10.000Z" itemprop="datePublished" class="page-time">
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            <ol class="post-toc"><li class="post-toc-item post-toc-level-2"><a class="post-toc-link" href="#学习笔记-：Java-Servlet-的生命周期及其解析"><span class="post-toc-number">1.</span> <span class="post-toc-text">学习笔记 ：Java Servlet 的生命周期及其解析</span></a><ol class="post-toc-child"><li class="post-toc-item post-toc-level-3"><a class="post-toc-link" href="#Servlet-2-5-示例"><span class="post-toc-number">1.1.</span> <span class="post-toc-text">Servlet 2.5 示例</span></a></li><li class="post-toc-item post-toc-level-3"><a class="post-toc-link" href="#Servlet-3-0-示例"><span class="post-toc-number">1.2.</span> <span class="post-toc-text">Servlet 3.0 示例</span></a></li><li class="post-toc-item post-toc-level-3"><a class="post-toc-link" href="#总结深究-待解决的问题"><span class="post-toc-number">1.3.</span> <span class="post-toc-text">总结深究 ( 待解决的问题 )</span></a><ol class="post-toc-child"><li class="post-toc-item post-toc-level-4"><a class="post-toc-link" href="#发现学习中我并没有关闭Tomcat服务器-但自动执行了销毁方法destory-于是查了一些资料-至今还未发现其答案-我认为-应该是Tomcat新版本的特性吧-超时自动销毁Servlet-但是自动调用Destory-时与Service-时间差也太小了吧-36-秒啊"><span class="post-toc-number">1.3.1.</span> <span class="post-toc-text">发现学习中我并没有关闭Tomcat服务器,但自动执行了销毁方法destory() ! 于是查了一些资料,至今还未发现其答案,我认为 : 应该是Tomcat新版本的特性吧(超时自动销毁Servlet?),但是自动调用Destory()时与Service()时间差也太小了吧 ! 36 秒啊 !</span></a></li></ol></li></ol></li></ol>
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        <h1 class="post-card-title">Servlet lifecycle</h1>
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            <time class="post-time" title="2019-04-06 15:06:10" datetime="2019-04-06T15:06:10.000Z"  itemprop="datePublished">2019-04-06</time>

            


            

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            <h2 id="学习笔记-：Java-Servlet-的生命周期及其解析"><a href="#学习笔记-：Java-Servlet-的生命周期及其解析" class="headerlink" title="学习笔记 ：Java Servlet 的生命周期及其解析"></a>学习笔记 ：Java Servlet 的生命周期及其解析</h2><ul>
<li><p><em>Tomcat v9.0 + JDK 11 + Google Chrome</em></p>
</li>
<li><p><em>Servlet lifecycle</em></p>
</li>
<li><figure class="image-bubble">
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                    <img src="/2019/04/06/Servlet-lifecycle/lifecycle.png" alt title>
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            </figure>
</li>
</ul>
<h3 id="Servlet-2-5-示例"><a href="#Servlet-2-5-示例" class="headerlink" title="Servlet 2.5 示例"></a>Servlet 2.5 示例</h3><ul>
<li><p><em>JSP program</em></p>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">%@</span> <span class="attr">page</span> <span class="attr">language</span>=<span class="string">"java"</span> <span class="attr">contentType</span>=<span class="string">"text/html; charset=ISO-8859-1"</span> <span class="attr">pageEncoding</span>=<span class="string">"ISO-8859-1"</span>%&gt;</span></span><br><span class="line"><span class="meta">&lt;!DOCTYPE html&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">html</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">head</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">meta</span> <span class="attr">charset</span>=<span class="string">"ISO-8859-1"</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">title</span>&gt;</span>Servlet 2.5<span class="tag">&lt;/<span class="name">title</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;/<span class="name">head</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">body</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">a</span> <span class="attr">href</span>=<span class="string">"ServletLifecyle"</span>&gt;</span>doGet : Servlet 3.0<span class="tag">&lt;/<span class="name">a</span>&gt;</span></span><br><span class="line">		<span class="comment">&lt;!-- 注意: form的默认提交方式为get --&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">div</span>&gt;</span></span><br><span class="line">			<span class="tag">&lt;<span class="name">form</span> <span class="attr">action</span>=<span class="string">"ServletLifecyle"</span> <span class="attr">method</span>=<span class="string">"get"</span>&gt;</span><span class="tag">&lt;<span class="name">hr</span>&gt;</span></span><br><span class="line">				<span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"submit"</span> <span class="attr">value</span>=<span class="string">"doGet "</span> /&gt;</span></span><br><span class="line">			<span class="tag">&lt;/<span class="name">form</span>&gt;</span></span><br><span class="line">			<span class="tag">&lt;<span class="name">form</span> <span class="attr">action</span>=<span class="string">"ServletLifecyle"</span> <span class="attr">method</span>=<span class="string">"post"</span>&gt;</span><span class="tag">&lt;<span class="name">br</span>&gt;</span></span><br><span class="line">				<span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"submit"</span> <span class="attr">value</span>=<span class="string">"doPost"</span> /&gt;</span></span><br><span class="line">			<span class="tag">&lt;/<span class="name">form</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;/<span class="name">body</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">html</span>&gt;</span></span><br></pre></td></tr></table></figure>
</li>
<li><p><em>Servlet program</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">ServletLifecyle</span> <span class="keyword">extends</span> <span class="title">HttpServlet</span> </span>&#123;</span><br><span class="line">	</span><br><span class="line">	</span><br><span class="line">	<span class="meta">@Override</span></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">init</span><span class="params">()</span> <span class="keyword">throws</span> ServletException </span>&#123;</span><br><span class="line">		<span class="comment">// TODO Auto-generated method stub</span></span><br><span class="line">		<span class="comment">//super.init();</span></span><br><span class="line">		System.out.println(<span class="string">"(Servlet 2.5)init() .."</span>);</span><br><span class="line">	&#125;</span><br><span class="line">	</span><br><span class="line">	<span class="meta">@Override</span></span><br><span class="line">	<span class="function"><span class="keyword">protected</span> <span class="keyword">void</span> <span class="title">doGet</span><span class="params">(HttpServletRequest req, HttpServletResponse resp)</span> <span class="keyword">throws</span> ServletException, IOException </span>&#123;</span><br><span class="line">		<span class="comment">// TODO Auto-generated method stub</span></span><br><span class="line">		<span class="comment">//super.doGet(req, resp);</span></span><br><span class="line">		System.out.println(<span class="string">"service() -&gt; doGet() + doPost() .."</span>);</span><br><span class="line">	&#125;</span><br><span class="line">	</span><br><span class="line">	<span class="meta">@Override</span></span><br><span class="line">	<span class="function"><span class="keyword">protected</span> <span class="keyword">void</span> <span class="title">doPost</span><span class="params">(HttpServletRequest req, HttpServletResponse resp)</span> <span class="keyword">throws</span> ServletException, IOException </span>&#123;</span><br><span class="line">		<span class="comment">// TODO Auto-generated method stub</span></span><br><span class="line">		<span class="comment">//super.doPost(req, resp);</span></span><br><span class="line">		<span class="keyword">this</span>.doGet(req, resp);</span><br><span class="line">	&#125;</span><br><span class="line">	</span><br><span class="line">	<span class="meta">@Override</span></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">destroy</span><span class="params">()</span> </span>&#123;</span><br><span class="line">		<span class="comment">// TODO Auto-generated method stub</span></span><br><span class="line">		<span class="comment">//super.destroy();</span></span><br><span class="line">		System.out.println(<span class="string">"destory() .."</span>);</span><br><span class="line">	&#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">/*</span></span><br><span class="line"><span class="comment"></span></span><br><span class="line"><span class="comment">### 1-第一次点击请求连接时Servlet响应的结果如下 :</span></span><br><span class="line"><span class="comment">Apr 05, 2019 10:27:32 PM org.apache.catalina.core.StandardContext reload</span></span><br><span class="line"><span class="comment">INFO: Reloading Context with name [/Servlet_basic_lifecycle] is completed</span></span><br><span class="line"><span class="comment">(Servlet 2.5)init() ..                  &lt;—— the result</span></span><br><span class="line"><span class="comment">service() -&gt; doGet() + doPost() ..      &lt;—— the result</span></span><br><span class="line"><span class="comment"></span></span><br><span class="line"><span class="comment"></span></span><br><span class="line"><span class="comment">### 2-当返回再次点击链接请求时Servlet响应的结果如下 : </span></span><br><span class="line"><span class="comment">Apr 05, 2019 10:31:05 PM org.apache.catalina.core.StandardContext reload</span></span><br><span class="line"><span class="comment">INFO: Reloading Context with name [/Servlet_basic_lifecycle] is completed</span></span><br><span class="line"><span class="comment">(Servlet 2.5)init() ..					&lt;— 第一次点击链接时Servlet的相应结果</span></span><br><span class="line"><span class="comment">service() -&gt; doGet() + doPost() ..		&lt;— 第一次点击链接时Servlet的相应结果</span></span><br><span class="line"><span class="comment">service() -&gt; doGet() + doPost() ..		&lt;— 第二次点击链接时Servlet的相应结果</span></span><br><span class="line"><span class="comment">service() -&gt; doGet() + doPost() ..		&lt;— 第三次点击链接时Servlet的相应结果</span></span><br><span class="line"><span class="comment">service() -&gt; doGet() + doPost() ..		&lt;— 第四次点击链接时Servlet的相应结果</span></span><br><span class="line"><span class="comment">...</span></span><br><span class="line"><span class="comment"></span></span><br><span class="line"><span class="comment"></span></span><br><span class="line"><span class="comment">### 3-上述来回来点击链接请求后且稍许时间后会发现Servlet自动调用了destory() !!!?</span></span><br><span class="line"><span class="comment">Apr 05, 2019 10:31:05 PM org.apache.catalina.core.StandardContext reload</span></span><br><span class="line"><span class="comment">INFO: Reloading Context with name [/Servlet_basic_lifecycle] is completed</span></span><br><span class="line"><span class="comment">(Servlet 2.5)init() ..</span></span><br><span class="line"><span class="comment">service() -&gt; doGet() + doPost() ..</span></span><br><span class="line"><span class="comment">service() -&gt; doGet() + doPost() ..</span></span><br><span class="line"><span class="comment">service() -&gt; doGet() + doPost() ..</span></span><br><span class="line"><span class="comment">service() -&gt; doGet() + doPost() ..</span></span><br><span class="line"><span class="comment">Apr 05, 2019 10:31:41 PM org.apache.catalina.core.StandardContext reload</span></span><br><span class="line"><span class="comment">INFO: Reloading Context with name [/Servlet_basic_lifecycle] has started</span></span><br><span class="line"><span class="comment">destory() ..</span></span><br><span class="line"><span class="comment"></span></span><br><span class="line"><span class="comment"></span></span><br><span class="line"><span class="comment">### 由上述1,2,3可得如下结论 : </span></span><br><span class="line"><span class="comment">init() :</span></span><br><span class="line"><span class="comment">    默认情况下第一次访问Servlet时会被执行( 只执行一次 ),扩 : 也可以通过配置web.xml文件使得Tomcat启动时自动执行.(详见下述`web.xml`示例)</span></span><br><span class="line"><span class="comment">service() : </span></span><br><span class="line"><span class="comment">    包括doGet()和doPost(),执行的次数与调用次数成正比.</span></span><br><span class="line"><span class="comment">destory() : </span></span><br><span class="line"><span class="comment">    关闭Tomcat服务时执行一次.</span></span><br><span class="line"><span class="comment"></span></span><br><span class="line"><span class="comment">*/</span></span><br></pre></td></tr></table></figure>
</li>
<li><p><em>web.xml</em></p>
</li>
</ul>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">&lt;?xml version="1.0" encoding="UTF-8"?&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">web-app</span> <span class="attr">xmlns:xsi</span>=<span class="string">"http://www.w3.org/2001/XMLSchema-instance"</span> <span class="attr">xmlns</span>=<span class="string">"http://xmlns.jcp.org/xml/ns/javaee"</span> <span class="attr">xsi:schemaLocation</span>=<span class="string">"http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"</span> <span class="attr">id</span>=<span class="string">"WebApp_ID"</span> <span class="attr">version</span>=<span class="string">"4.0"</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">display-name</span>&gt;</span>Servlet_basic_lifecycle<span class="tag">&lt;/<span class="name">display-name</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">welcome-file-list</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">welcome-file</span>&gt;</span>index.html<span class="tag">&lt;/<span class="name">welcome-file</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">welcome-file</span>&gt;</span>index.htm<span class="tag">&lt;/<span class="name">welcome-file</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">welcome-file</span>&gt;</span>index.jsp<span class="tag">&lt;/<span class="name">welcome-file</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">welcome-file</span>&gt;</span>default.html<span class="tag">&lt;/<span class="name">welcome-file</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">welcome-file</span>&gt;</span>default.htm<span class="tag">&lt;/<span class="name">welcome-file</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">welcome-file</span>&gt;</span>default.jsp<span class="tag">&lt;/<span class="name">welcome-file</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;/<span class="name">welcome-file-list</span>&gt;</span></span><br><span class="line">  </span><br><span class="line">  <span class="comment">&lt;!-- Servlet 2.5 --&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">servlet</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">servlet-name</span>&gt;</span>sameName<span class="tag">&lt;/<span class="name">servlet-name</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">servlet-class</span>&gt;</span>pers.huangyuhui.servlet.test.ServletLifecyle<span class="tag">&lt;/<span class="name">servlet-class</span>&gt;</span></span><br><span class="line">		<span class="comment">&lt;!-- 使得tomcat启动时自动加载init()方法,其数字代表: 当有多个Servlet时,规划其启动的顺序,默认值为`-1`. --&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">load-on-startup</span>&gt;</span>1<span class="tag">&lt;/<span class="name">load-on-startup</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;/<span class="name">servlet</span>&gt;</span></span><br><span class="line"></span><br><span class="line">	<span class="tag">&lt;<span class="name">servlet-mapping</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">servlet-name</span>&gt;</span>sameName<span class="tag">&lt;/<span class="name">servlet-name</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">url-pattern</span>&gt;</span>/ServletLifecyle<span class="tag">&lt;/<span class="name">url-pattern</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;/<span class="name">servlet-mapping</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">web-app</span>&gt;</span></span><br></pre></td></tr></table></figure>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">通过在`web.xml`配置文件中添加<span class="string">'&lt;load-on-startup&gt;1&lt;/load-on-startup&gt;'</span>使得Tomcat启动时自动加载init() !</span><br><span class="line"></span><br><span class="line">INFO: At least one JAR was scanned <span class="keyword">for</span> TLDs yet contained no TLDs. Enable debug logging <span class="keyword">for</span> <span class="keyword">this</span> logger <span class="keyword">for</span> a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.</span><br><span class="line">(Servlet <span class="number">2.5</span>)init() ..	&lt;——— the result.</span><br><span class="line">Apr <span class="number">06</span>, <span class="number">2019</span> <span class="number">2</span>:<span class="number">31</span>:<span class="number">09</span> PM org.apache.coyote.AbstractProtocol start</span><br><span class="line">INFO: Starting ProtocolHandler [<span class="string">"http-nio-8080"</span>]</span><br><span class="line">Apr <span class="number">06</span>, <span class="number">2019</span> <span class="number">2</span>:<span class="number">31</span>:<span class="number">09</span> PM org.apache.coyote.AbstractProtocol start</span><br><span class="line">INFO: Starting ProtocolHandler [<span class="string">"ajp-nio-8009"</span>]</span><br><span class="line">Apr <span class="number">06</span>, <span class="number">2019</span> <span class="number">2</span>:<span class="number">31</span>:<span class="number">09</span> PM org.apache.catalina.startup.Catalina start</span><br><span class="line">INFO: Server startup in [<span class="number">2</span>,<span class="number">686</span>] milliseconds</span><br></pre></td></tr></table></figure>
<h3 id="Servlet-3-0-示例"><a href="#Servlet-3-0-示例" class="headerlink" title="Servlet 3.0 示例"></a>Servlet 3.0 示例</h3><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/*</span></span><br><span class="line"><span class="comment">Servlet 3.0 较2.5可以通过注解使Tomcat启动时自动加载Servlet 中的初始化方法: init().</span></span><br><span class="line"><span class="comment"></span></span><br><span class="line"><span class="comment">@WebServlet(value="/ServletTest" , loadOnStartup=1)</span></span><br><span class="line"><span class="comment">value : 其为一个字符串数组对象,用于接收多个Servlet,当只有一个Servlet时默认可以不写.</span></span><br><span class="line"><span class="comment">loadOnStartup : 当有多个Servlet时将按照数字大小顺序执行.其默认为-1.</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"></span><br><span class="line"><span class="meta">@WebServlet</span>(value=<span class="string">"/ServletTest"</span> , loadOnStartup=<span class="number">1</span>)</span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">ServletTest</span> <span class="keyword">extends</span> <span class="title">HttpServlet</span> </span>&#123;</span><br><span class="line">	<span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">final</span> <span class="keyword">long</span> serialVersionUID = <span class="number">1L</span>;</span><br><span class="line"></span><br><span class="line">    ······</span><br></pre></td></tr></table></figure>
<h3 id="总结深究-待解决的问题"><a href="#总结深究-待解决的问题" class="headerlink" title="总结深究 ( 待解决的问题 )"></a>总结深究 ( 待解决的问题 )</h3><h4 id="发现学习中我并没有关闭Tomcat服务器-但自动执行了销毁方法destory-于是查了一些资料-至今还未发现其答案-我认为-应该是Tomcat新版本的特性吧-超时自动销毁Servlet-但是自动调用Destory-时与Service-时间差也太小了吧-36-秒啊"><a href="#发现学习中我并没有关闭Tomcat服务器-但自动执行了销毁方法destory-于是查了一些资料-至今还未发现其答案-我认为-应该是Tomcat新版本的特性吧-超时自动销毁Servlet-但是自动调用Destory-时与Service-时间差也太小了吧-36-秒啊" class="headerlink" title="发现学习中我并没有关闭Tomcat服务器,但自动执行了销毁方法destory() ! 于是查了一些资料,至今还未发现其答案,我认为 : 应该是Tomcat新版本的特性吧(超时自动销毁Servlet?),但是自动调用Destory()时与Service()时间差也太小了吧 ! 36 秒啊 !"></a>发现学习中我并没有关闭<code>Tomcat</code>服务器,但自动执行了销毁方法<code>destory()</code> ! 于是查了一些资料,至今还未发现其答案,我认为 : 应该是<code>Tomcat</code>新版本的特性吧(超时自动销毁Servlet?),但是自动调用<code>Destory()</code>时与<code>Service()</code>时间差也太小了吧 ! 36 秒啊 !</h4><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line">### 3-上述来回来点击链接请求后且稍许时间后会发现Servlet自动调用了destory() !!!?</span><br><span class="line">Apr <span class="number">05</span>, <span class="number">2019</span> <span class="number">10</span>:<span class="number">31</span>:<span class="number">05</span> PM org.apache.catalina.core.StandardContext reload</span><br><span class="line">INFO: Reloading Context with name [/Servlet_basic_lifecycle] is completed</span><br><span class="line">(Servlet <span class="number">2.5</span>)init() ..</span><br><span class="line">service() -&gt; doGet() + doPost() ..       &lt;—— the result</span><br><span class="line">service() -&gt; doGet() + doPost() ..       &lt;—— the result</span><br><span class="line">service() -&gt; doGet() + doPost() ..       &lt;—— the result</span><br><span class="line">service() -&gt; doGet() + doPost() ..       &lt;—— the result</span><br><span class="line">Apr <span class="number">05</span>, <span class="number">2019</span> <span class="number">10</span>:<span class="number">31</span>:<span class="number">41</span> PM org.apache.catalina.core.StandardContext reload</span><br><span class="line">INFO: Reloading Context with name [/Servlet_basic_lifecycle] has started</span><br><span class="line">destory() ..    &lt;—— the result ? what happend ! ? (I<span class="string">'m not close the the Tomcat server now)</span></span><br><span class="line"><span class="string"></span></span><br><span class="line"><span class="string">······</span></span><br></pre></td></tr></table></figure>
<ul>
<li><em>注意 : <code>&lt;——</code> 是本人后期为便于大家审阅代码加上的.</em></li>
<li><em>后期在不断学习中会完善这些我未知的问题的 ! Stay hungry,Stay foolish.</em></li>
</ul>

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    var OriginTitile = document.title, titleTime;
    document.addEventListener('visibilitychange', function() {
        if (document.hidden) {
            document.title = 'Where are you going ?';
            clearTimeout(titleTime);
        } else {
            document.title = 'As long as you love me ~';
            titleTime = setTimeout(function() {
                document.title = OriginTitile;
            },2000);
        }
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})();
</script>



</body>
</html>
